package ru.study.thinkin.chapter11;

import java.util.*;

public class SetOperation {

	public static void main(String[] args) {
		Set<String> set1 = new HashSet(); 
		set1.add("Q");
		set1.add("W");
		set1.add("E");
		System.out.println(set1.contains("W"));		
	}

}
